Is this ferrite is from the spinel group? can anyone explain the tetrahedral and octahedral sites pf elements for this above formula? If Cr(2+) and if Cr(3+) is doped, describe the substitution/replacement of Cr/Zn, Mg, or Fe.
Dear Sir,
your ferrite is a spinel. You will find general information and bibliography on spinel ferrites in the papers:
- Original Spinel Ferrites for New Mass Storage Media Ph. Tailhades Pages 3-26 in Nano-Crystalline and Thin Film Magnetic Oxides NATO Series 1998.
- Mixed-Valence Defect Ferrites : a New Family of Fine Powders and Thin Films of Spinel Ferrites, Tailhades et al. Journal de Physique IV Colloque, 1997, 07 (C1), pp.C1-249-C1-252.
You will find also interesting data about chromium ferrites in the works of B. Gillot and A. Rousset.
Chromium cations are generally Cr3+ located in octahedral (Oh) sites in spinel ferrites. Zn2+ is preferably located in Td sites, Mg2+ has not a strong preference for Td or Oh sites. You will find data in the works of A. Navrotsky.
Good work!.
Ph. Tailhades.
Thanks for sharing such good information. I am writing a thesis about doped chromium (trivalent) in spinel (ferrite ).
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